Drill head



Dec. 2, 1941. L. D. BARLEY ETAL 2,264,786

DRILL'HEAD Filed Dec. 2l, 1939 3 Sheets-Shea?I l P 'o 49254-7 46 I fe 4I 1- .mi 4 l I 0| 20 4 ATTORNEYS Dec. 2, 1941. L. D. BARLEY ETAL DRILLHEAD Filed Dec. 21, 1959 5 Sheets-Sheet 2 nvvENToRs 0 0. me/.fr

Dec. 2, 1941. l., D. BARLEY ErAL 2,264,786

DRILL HEAD Filed Deo. 21, 1939 3 Sheets-Sheet 3 ATTORN 5 Patented Dec.2, 1941 nam. HEAD Leo D. Barley and Edwlnw. Bradmiller, Dayton,

Ohio, assignors to Harris-Seybold-Potter Company, Cleveland, Ohio, acorporation of Dela- Ware Application December 21, 1939, serial No.310,280

13 Claims.

This invention relates to a drill head, more specifically toa drill headfor a single or multiple head paper drilling or perforating machine. Fora full disclosure of a machine of this general type reference may be hadto Lewis and Seybold Patent 2,044,709, dated June 16, 1936.

One of the objects of the invention is the provision of nov-el means forchucking the boring tool in its spindle, and especially means which maybe conveniently'and quickly manipulated without the machine is running,for adjusting the spindle axially, and with double thrust bearings totake the load when the tool enters the work and also when it iswithdrawn from the work.

A further object is the provision of an auxiliary presser foot which maybe removably attached to the' head whenever additional pressure on thepile is desired, as for instance when soft stock is being perforated.

Other objects and features of novelty will appear as we proceed with thedescription of those embodiments of the invention which, for thepurposes ofthe present application, we have illustrated in theaccompanying drawings, in which- Fig. 1 is a vertical sectional view ofa drill headwith that portion of a perforating machine on which the headis directly supported.

Fig. 2 is an edge view of the drill head partly in vertical section onthe line 2 2 of Fig. 1.

Fig. 3 is a top plan view of the head.

Figs. 4, 5, 6 and 7 are horizontal sectional views taken substantiallyon the lines 4-4, 5-5, 6-6 and 1-1 of Fig. 1.

Fig. 8 is a larger scale detail sectional view taken substantially onthe line 8-8 of Fig. 1.

- Fig. 9 is a view similar to Fig. 1 showing a modied form of spindleadjustment.

Fig. 10 is an edge elevational view of the same, partly in verticalsection on the line Ill- Ill of Fig. 9.

Fig. 11 is a transverse sectional view taken substantially on the line II--II of Fig. 10.

Fig. 12 is a detail view partly in vertical section of a fragment of adrill spindle with a boring tool in place therein.

Fig. 13 is a cross sectional view taken substantially on the line I3-I3of Fig. 12.

Referring to Fig. l, I0 represents ,a horizontal transverse beam or barof a multiple head paper perforating machine, this beam constitutingmeans for supporting one or more drill heads in selected positionscrosswise of the machine. Each drill head comprises a housing II whichis adjustable along a dovetail way I2 on the beam I0. A screw clamp I3serves to bind the head I I rmly to the beam- IIl, and when loosened topermit sliding the head transversely of the machine.

A shaft I4 arranged parallel to the beam I 0 is journalled at its endsin the machine frame and is driven by an electric motor or othersuitable prime mover, not shown. The shaft is provided with a keyway4 I5to receive a key I6 projecting inwardly fromy the hub of a spiral gearI1 surrounding the shaft and mounted between the side walls o f thehousing II, The shaft therefore drives the spiral gear in any of thepositions of adjustment of the head.

The spindle I6 comprises a solid upper portion mounted in anti-frictionbearings I9 and 20 and a hollow cylindrical portion 2I mounted in aneedle bearing 22. Surrounding the solid portion of the spindle betweenthe bearings I9 and 20 is a spiral gear 23 meshing with spiral gear I1.The spindle is provided with a keyway 24 which receives the driving key25 carried by the gear 23 and projecting into keyway 24, so that thespindle may be adjusted vertically without interlering with its drivingconnection with the gear.

26 is a collar formed integral with the spindle and 2l is another collarpinned to the spindle. Thrust bearings 28 and 29 surround the spindleadjacent the collars 26 and 2l respectively and are spaced apart andheld in position against the collars by a slide 30 which is adapted tomove within a cylindrical pocket 3I in the housing. Obviously when theslide 30 is caused to move up or down in this pocket the bearings 28 and29 and the collars 26 and 2l must move also, and hence the spindle movesaccordingly. 'Ihe slide does not rotate with the spindle. It is slottedon one side to receive a nut 32 that is threaded upon the threaded lowerextremity of a vertical shaft 33 having smooth bearing portions 34 and35 journalled in a vertical bore in the housing-L ,Y Above the bearingportion 35 there is an extenin the other .direction by engagement of theshoulder above portion Il with the plate I1. A knurled knob u may besecured to the extension Il by a set screw 4l so as to provide an easymeans of turning the shaft Il. and in order to indicate the extent ofmovement of the slide 32 and hence of the spindle we provide a springdetent 4l which is adapted to take into any one of a plurality ofindentations 42 in the upper surface of plate 31. Preferably we usepitch threads on shaft 33 and in nut 32 and employ five indentations 42evenly spaced around the hole in plate I1, whereby each turn of the knob39 from one notch to the next gives a spindle adjustment of tenthousandths of an inch.

In Figs. 9, 10 and 11 of the drawings we have illustrated a modificationof the spindle adjusting means which we may employ in cases where it isnecessary or desirable to have the presser foot plunger set close to thespindle. In this case instead of a long shaft 33 in front of the spindlewe employ a short shaft 43 rearwardly of the spindle mounted in avertical bore in the housing and provided with an enlarged threadedportion 44 at its lower end and a worm wheel 4l cut into its upper end.A plug 48 held in place by a pin 41 takes the downward thrust of shaft43, and the upward thrust is taken by the housing directly against theextreme upper end of the shaft. A horizontally extending shaft 4l with aknurled outer end is rotatably mounted in the housing and has a worm 49thereon meshing with the worm wheel 4'5, whereby rotation imparted toshaft 48 by the operator is communicated to shaft 43 at a slower rate. Ablock 8 removably attached to the housing by a screw l, Fig. l1, permitsthe shaft 48 to be inserted in its bore during assembly, and functionsas an abutment for one end of the shaft to take thrust in one directionwhile the end of the worm bearing against the housing takes thrust inthe opposite direction.

A paper boring tool or drill having a hollow bit portion 50 and a hollowshank 5| is removably mounted in the hollow portion 2| at the lower endof the spindle. As shown in Fig. 1 this tool has a tapered shoulder 52between the shank and the bit, and intermediate the shoulder and thebutt end of the shank there is an annular groove 53 which may berectangular in cross section. At the same elevation as the groove 53there is an annular groove 54 in the outer wall of the hollow spindle2l. There is also an opening 55 through the Wall of the spindlecommunicating with groove 54, and in the shaft of the tool there is asocket 56 extending inwardly from the groove 53 in that member andadapted to register with the opening 55. A spring ring 5l', that isbowed in cross section as shown in Fig. 1, is positioned in the groove54 and is provided with an inturned rebent end '58 which extends throughopening and into groove 53, and when the tool is turned to the properangular position may be caused to project into the socket 56. 'I'hisrebent end 58 forms a retainer which serves not only to support the toolbut also to lock it against rotation with respect to the spindle.

The lower end of the hollow spindle is provided with a plurality oi'slots 59 which divide the spindle into chucking jaws 60 that are beveledoif internally to form a tapered seat 6i' complementary to the taperedshoulder 52.

The hollow spindle is threaded externally to receive a clamping collar8| which has a bevel 75 vthe lower end of the shaft with the housing,and

cam surface at each end. The upper cam surface l2 is adapted to engagethe bowed outer surface of ring Il so that when the collar 4is threadedupwardly on the f-spindle the ring I1 is contracted and the retainerportion I! A.may be projected into the socket The lower-cam surface Ilis adapted to engage a correspondingly beveled external cam surface I4on the chucking `Jaws Il. Consequently when the collar is threadedupwardly to the proper extent the two cam surfaces Il and I4 engage eachother and force the laws I inwardly. causing the taper surfaces Il' tobear with premure against the tapered shoulder l2 on the tool. Thelatter pressure tends to force the tool downwardly and thereby causesthe tool to pull downwardly upon the retainer. In this way whatever`play there may be between the retainer and the socket in the shank istaken up. At the same time the bevel or taper surfaces accurately centerthe lower end of the tool shank. Furthermore the taper seat on thespindle takes the thrust of the tool when it enters the paper pile andthe spindle transmits it to the thrust bearing 2l.

The replacement of a boring tool involves the loosening of the collar Ilwhich enables the spring ring to expand and its retainer portion 58 towithdraw from the socket 5l and the groove 53. Thereupon a slightdownward pull upon the tool. exerted by the operator. will cam theretainer 58 outwardly and permit the tool to be withdrawn. A new toolmay then be inserted, that is pushed upwardly as far as it will go intothe hollow spindle, when the retainer 5I will enter the groove 5I in thetool shank. The operator now turns the tool through a portion of arevolution until the socket 5I therein comes into register with theopening 5l. The ring will then contract slightly, causing the retainerto partially enter the socket 5l, of which action the operator willbecome apprised by the sense of feeling if not by a slight audibleclick. There remains nothing further to be done except to turn up thecollar il again, forcing the retainer further into its socket andcausing the chucking jaws to exert pressure on the tapered shoulder ofthe tool.

A modification of the tool chucking means is illustrated in Figs. 12 and13. In this construction the hollow spindle is not slotted. In its outerwall it has an annular groove preferably semi-circular in cross sectionin which is mounted a spring ring that is circular or semi-circular incross section and has an inwardly directed bent end or retainer portion66 which projects through an opening 61 in the spindle. El is a cavityinto which the thumb or finger of the operator may be inserted in orderto retract the retainer 66. In the outer wall of the shank 5i there isan annular groove 69 which is cam shaped in cross section. 'I'his groovepreferably has a curved bottom which is deeper at the lower side of thegroove than at the upper side. The upper part of the groove in factsubstantially corresponds in curvature with the cross sectionalcurvature of the ring I4, so that when the tool is being pulled out ofthe work it is impossible for the tool to be unintentionally withdrawnfrom the spindle.

A tapered shoulder 52 on the tool like that on the tool of Fig. l isadapted to engage a similarly shaped taper seat il" on the spindlecorresponding to the seat 6| of the Fig. l form. To prevent relativerotation between the spindle and the tool shank 5| there is provided avertical groove 10 which receives a drive pin 1| mounted 'in theSpindle. Y

When a tool is to be mounted in the spindle the operator' pulls theretainer portion 68 of the spring ring outward far enough to permit theshank of the tool to pass the ring and turns the tool until the grooveregisters with the pin 1|. Upward pressure on the tool is then continueduntil the retainer portion 66 of the spring ring snaps into the groove68. The operator then releases his hold upon the tool and the cam groove69 acting upon the curved surface of spring ring retainer 66 tends topull the tool l shank upward and cause the tapered shoulder on the shankto press against the tapered seat 6| and take up any longltudinalplaywhich would otherwise be present as between the tool and the spindle. Inthis i'orm of chucking means the vcam groove 69 exerts a pull throughthe tool shank to cause the tapered shoulder 52 to press against theseat 6|", while in the rst described form of chucking means thecompression of the chucking jaws 60 cams the tapered shoulder 52downwardly to exert a pull through the tool shankon the spring ring 51.In both cases the result is to take up any longitudinal play which wouldotherwise be present as between the tool and spindle.

Referring now to Figs. 1 and 7, a presser foot 12 is provided forengagement with a pile of paper vP directly adjacent to the tool. Inthis instance the foot has a hole 13 therein through which the bit 50 ofthe boring tool projects. 14 is a post or plunger which is preferablysquare for the greater portion of its length but has a cylindrical lowerend thatis threaded into a threaded hole in the foot 12, a lock nut 15being provided for holding the parts against accidental movement. Nearthe top and bottom of the housing two blocks 16 and 11 with squareopenings therethrough for. the reception of the plunger are secured inplace by set screws 16 and 19 respectively, and serve as guides for theplunger. These blocks t into a cylindrical bore 80. A third block 8|adapted to slide Within the bore 80 is attached to the plunger 14 by aset screw 82 and forms one abutment for a coil spring 83 which surroundsthe plunger, the block 16 constituting the upper abutment for thespring. Block 8| is adjustable. upon the plunger, two indentations 84being provided to receive the set screw 82 in order that the spring'maybe loaded preliminarily to different degrees.

The presser foot 12 with the plunger 14 and the spring 83 functionsatisfactorily for most of the operations which the machine may becalled upon to perform, but occasionally and particularly where softstock is to be perforated a greater pressure is advisable or necessary.For such purposes we provide an auxiliary presser foot assembly whichmay be attached to the head or detached therefrom readily and quickly.It comprises top and bottom plates 85 and 86 fastened to the housing byscrews 81 and 88, the plates being separated by and welded to a flatpost 89. A pin 98 riveted to post 89 projects into a slot 9| in thehousing and helps to steady the assembly as well as to take some of thestrain by bearing against the upper end of the slot.

A round post or plunger is guided by the plates 85 and 86, the upperplate 85 having a relatively small hole therethrough to accommodate asmall diameter portion 92 of the plunger and the lower plate 86 having arelatively large opening therethrough to accommodate a larger diameterportion 93 of the plunger. A coil spring 94 bears at its lower endagainst the shoulder formed at the Iiuncture or the small'ano largediameter portions of the plunger, and at the other end it bears againstthe bottom surface oi' plate 86. At the lower end of the plunger 92, 93there is welded an auxiliary foot 96. At its opposite end this foot isbifurcated so that it may surround the nut 16 on plunger 14, andpreferably it carries a pair of pins 96 which extend into holes in thetop ofpresser foot 12. The force of spring 94 is thereby added to thatofspring 83, and the force exerted by the presser foot may be doubled ortrebled if necessary.

The presser foot 12 of Figs. 9 and 10 is the same in function as thepresser foot 12 above described, although it is of slightly dierentform. The plunger 14 and associated parts are identical with thecorresponding parts illustrated in Fig. 1 except that for greaterconvenience a thumb screw 91 is substituted for the set screw 82. andits shank projects entirely through the slot 9|. A thumb screw 81 ofcourse cannot be employed when the auxiliary presser foot is in use.

The operation ofthe drill head will be apparent it is believed from theabove description of its parts,v particularly in connection with Patent2,044,709 above referred to, wherein is shown and described a completemachine adapted to take a head of the kind herein described.` Two, threeor more of these heads may be used to form a like number of perforationsin a pile of paper or cardboard sheets, and the spindle of each head maybe adjusted independently while the machine is running and without theuse of hand tools. The drills or boring tools may be changed readily andquickly whenever the necessity arises, and the attachment of theauxiliary presser foot is also quickly effected.

In contradistinctionto the structures of the prior art it is to beespecially noted that the hollow portion 2| of the spindle has nointernal shoulder such as has been used formerly to absorb the thrust ofthe boring tool. The elimination of an internal shoulder at this pointpermits a much greater area within the hollow portion of the spindle tofacilitate discharge of the paper drillings or chips. A

Furthermore, the tapered shoulder 6| or 6|" of the boring tool, inaddition to absorbing the thrust thereof makes it self-centering andobviates any radial play such as was present in the prior conventionalconstructions, thus contributing materially to operating efllciency andaccuracy of production.

Having thus described our invention, we claim:

1. In a paper perforating machine, a spindle, a boring tool carriedthereby, spaced anti-friction bearings for said spindle, a pair ofspaced collars on said spindle at a point intermediate said bearings, aslide positioned between said collars, thrust bearings between saidslide and each of said collars, and means comprising a screw actuatableby hand during the operation of the machine for moving said slideaxially.

2. In a paper perforating machine, a spindle, a boring tool carriedthereby, spaced anti-friction bearings for said spindle, a pair ofspaced collars on said spindle at a point intermediate said bearings, aslide positioned between said collars, thrust bearings between saidslide and each of said collars, means comprising a screw actuatable byhand during the operation of the machine for moving said slide axially,and gauging means for indicating the extent of the slide adjustment.

3. In a paper perforating machine. a spindle head, a spindle adapted tocarry a boring tool, a slide surrounding said spindle normally4 ilxed insaid head, a collar ilxed to the spindle. a thrust bearing mountedbetween the collar and said slide, means for micrometrically adjustingthe slide axially. and gauging means tor indicating the extent ci theslide adjustment.

4. In a paper pericrating machine, a spindle head, a spindle adapted tocarry a boring tool, a slide surrounding said spindle normally iixed insaid head, an anti-friction bearing arranged to transmit thrust fromsaid spindle to said slide. means for micrometrically adjusting theslide axially, and gauging means for indicating the extent of the slideadjustment.

5. In a paper pertorating machine, a spindle head, a spindle, a boringtool carried thereby, a collar on said spindle, a slide surrounding saidspindle normally fixed in the spindle head, a thrust bearing betweensaid slide and said collar. and means for micrometrically adjusting saidslide axially in said head.

6. In a-paper periorating machine, a spindle head, a spindle, a boringtool carried thereby. a pair of spaced collars on said spindle. a slidepositioned between said collars normally nxed in the spindle head, athrust bearing between said slide and each .ot said collars, and meansi'or micrometrically adjusting said slide axially in said head.

r1..In a paper perforating machine, a spindle, a boring tool carriedthereby, spaced anti-friction bearings for said spindle. a pair ofspaced collars on said spindle ata point intermediate said bearings, aslide positioned between said collars, a thrust bearing between saidslide and each of said collars, and means for micrometrically adjustingsaid slide to move said spindle axially in its bearings.

8. In a paper periorating machine, a spindle, a boring tool carriedthereby, a spaced anti-friction bearings for said spindle, a pair o!spaced collars on said spindle at a point intermediate said bearings, aslide positioned between said colascenso lars, a thrust bearing betweenaaidsiide and each ci said collars, and means accessible from theexterior oi.' the machine and actuatabl'e during operation of the lattertor micrometrically moving said slide axially.

9. In a paper periorating machine, a spindle head, a spindle adapted tecarry a boring tool, a slide surrounding said spindle normally nxed inthe spindle head, a thrust bearing mounted within said slide forengagement with the spindle, and means for micrometrically adjusting theslide l axially in the head.

l0. In a paper periorating machine, a spindle head, a spindle adapted tocarry a boring tool, a slide surrounding said spindle normally nxed inthe spindle head, an anti-friction bearing arranged to transmit thrustfrom said spindle to said slide, and means for micrometrically adjustingthe slide axially in the head.

11. In a paper perforating machine, a spindle head, a vertical spindleadapted to carry a downwardly directed boring tool, a slide surroundingsaid spindle normally ilxed in said head. an antifriction bearingarranged to transmit upward thrust from said spindle to said slide, andmeans for micrometrically adjusting the slide axially in the head.

l2. In a paper periorating machine, a spindle vdie, a slide surroundingsaid spindle below said collar and normally fixed in said head, a thrustbearing between said slide and said collar, and means formicrometrically adjusting said slide axially in said head.

LEO D. BARLEY.

EDWIN W. BRADMILLER.

